Iron out rough edges in the trace output

[fabulous-gopher]

From @sdboyer on May 4, 2016 19:39

#21 wasn't perfect, and there are definitely still some rough edges left in the trace output. Let's call this a general tracking issue for working them out.

Copied from original issue: sdboyer/gps#22

[sdboyer]

This issue is both very dated and not terribly useful (even though there are still some bugs in the trace output). Closing.